[uClibc]uClibc fixes and a known bug which will be fixed tomorrow after discussion

[Manuel Novoa III]

The unified_syscall stuff for i386 should work now.

gcc-uClibc-i386 should work now for both shared and static cases.
    make CC=gcc-uClibc-i386      ( see extra/gcc-uClibc/ )
should build busybox with no Makefile modifications as a shared executable,
although you must still disable BB_FEATURE_NFSMOUNT.  Set DOSTATIC=true in the
busybox Makefile for a uClibc-linked static executable.

busybox tar currently fails because uClibc defines BUFSIZ to be 500 and busybox
assumes it to be at least 512.  This is arguably a bug in busybox as ANSI
specifies only that BUFSIZ be >= 256.  However, it might be worth changing in
uClibc.

Erik, is the setting of BUFSIZ to 500 an artifact or is there some reason we
shouldn't increase it just to avoid problems?

Manuel